CN111926243A - Martensite wear-resistant cast iron and preparation method of titanium-containing martensite wear-resistant cast iron for roller - Google Patents
Martensite wear-resistant cast iron and preparation method of titanium-containing martensite wear-resistant cast iron for roller Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
Abstract
The invention discloses a martensite wear-resistant cast iron and a preparation method of titanium-containing martensite wear-resistant cast iron for a roller, wherein the preparation method of the titanium-containing martensite wear-resistant cast iron for the roller comprises the following steps: s1, smelting: adding scrap steel, ferromolybdenum, ferrochromium, pure copper and pure nickel into a furnace for smelting, sampling and analyzing the content of each chemical component in the furnace after melting down, adding ferrotitanium and ferrovanadium to adjust the content of the chemical components in the furnace, raising the temperature and preparing tapping; s2, treatment outside the furnace: silicon-calcium-barium alloy and Fe are added along with the flow in the tapping process2O3Inoculating, modifying and refining the molten steel; s3, centrifugal casting: quickly pouring molten iron into a centrifugal casting mould rotating at a high speed, and centrifuging after pouringAdding casting powder into the casting mould; s4, modification treatment: and carrying out heat treatment on the titanium-containing martensite wear-resistant cast iron material for the roller to obtain the titanium-containing martensite wear-resistant cast iron for the roller. The titanium-containing martensite wear-resistant cast iron for the roller manufactured by the preparation method has high hardness, high impact resistance and high wear resistance.
Description
Technical Field
The invention belongs to the technical field of manufacturing, and particularly relates to a preparation method of martensite wear-resistant cast iron and titanium-containing martensite wear-resistant cast iron for a roller.
Background
At present, roller materials used for rolling section steel at home and abroad are mainly alloy cast iron, semisteel, graphite steel, tool steel and other series materials, and because the materials such as the alloy cast iron, the semisteel, the graphite steel and the like have the characteristics of low hardness, large radial hardness fall, poor wear resistance and the like, the defects of low steel excess, difficult obtainment of surface quality of rolled materials and the like during rolling generally exist, the tool steel series materials have the characteristics of complex preparation process, high subsequent treatment requirement and the like, and rollers prepared from the materials generally have low service life and low surface quality of rolled products.
Chinese patent CN201410085918 discloses a manufacturing method of a centrifugal casting free-cutting high-speed steel roll, and also discloses the annealing, quenching and tempering processes thereof to ensure that a graphite-containing high-speed steel matrix is obtained in a centrifugal casting state and in a subsequent heat treatment process, and the defects of complex heat treatment process, low temperature rise speed, long production period and the like.
Chinese patent CN110508785A discloses a hot-rolled section steel roll, which is characterized in that a grade SGA1 material is used as an outer layer, a grade QT500-5 material is used as a core material, and the requirements of high-quality section steel rolling are difficult to achieve due to low hardness and poor wear resistance of the roll under the influence of material characteristics.
Chinese patent CN106756617B discloses a high-hardness graphite steel section steel roll and a preparation method thereof, and the preparation process is complex, the heat treatment requirement is high, and the use performance is general. The roller material and the preparation method provided by the invention are difficult to meet the specific requirements of section steel rolling.
That is, new cast iron materials, such as high wear resistance, high steel content, high hardness, etc., need to be developed to meet higher use requirements, so that the roll made of the material can have a longer service life.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
Therefore, the invention provides a preparation method of the titanium-containing martensite wear-resistant cast iron for the roller, and the titanium-containing martensite wear-resistant cast iron for the roller prepared by the preparation method has high hardness, high impact resistance and high wear resistance.
Therefore, the invention also provides the martensitic wear-resistant cast iron which has the advantages of high hardness, high impact resistance and high wear resistance.
The preparation method of the titanium-containing martensitic wear-resistant cast iron for the roller according to the embodiment of the first aspect of the invention comprises the following steps:
s1, smelting: adding scrap steel, ferromolybdenum, ferrochromium, pure copper and pure nickel into a furnace for smelting, sampling and analyzing the content of each chemical component in the furnace after melting down, adding ferrotitanium and ferrovanadium to adjust the content of the chemical components in the furnace, raising the temperature and preparing tapping;
s2, treatment outside the furnace: silicon-calcium-barium alloy and Fe are added along with the flow in the tapping process2O3Inoculating, modifying and refining the molten steel;
s3, centrifugal casting: when the temperature of molten iron in the ladle is reduced to 1340-1400 ℃, rapidly pouring the molten iron into a centrifugal casting mold rotating at a high speed, adding protective slag into the centrifugal casting mold after the pouring is finished, and obtaining the titanium-containing martensite wear-resistant cast iron material for the roller by a centrifugal casting method;
s4, modification treatment: and carrying out heat treatment on the titanium-containing martensite wear-resistant cast iron material for the roller to obtain the titanium-containing martensite wear-resistant cast iron for the roller.
According to an embodiment of the invention, in the S1, ferrotitanium and ferrovanadium are added within 2-5 minutes before tapping.
According to an embodiment of the invention, in S1, the titanium-containing martensitic wear-resistant cast iron for the roll after adjusting the chemical composition content in the furnace comprises the following components in percentage by weight: c: 2.5-3.5%; si: 0.5-2.0%; mn: 0.5-2.0%; p is less than or equal to 0.1 percent; s is less than or equal to 0.03 percent; ni: 2.0-5.0%; mo: 1.0-3.0%; v: 0.5-3.0%; cr: 15-22%; cu: 0.5-3.0%; ti: 0.5 to 3.0 percent.
According to an embodiment of the invention, in the step S1, tapping is performed when the temperature is raised to 1600-1620 ℃.
According to an embodiment of the invention, in the S2, the content of the silicon-calcium-barium alloy is 2 to 4Kg per ton of iron.
According to an embodiment of the present invention, in the S2, the Fe2O3 The content of (b) is 4-7 Kg/ton of iron.
According to an embodiment of the invention, in the S3, the content of the mold flux is 8-10 Kg/m2。
According to an embodiment of the present invention, the mold flux is O-type mold flux.
According to an embodiment of the present invention, the heat treatment in S4 is a tempering treatment at 500 to 600 ℃.
The martensite wear-resistant cast iron obtained by the preparation method comprises the following components in percentage by weight:
C：2.5～3.5%；Si：0.5～2.0%；Mn：0.5～2.0%；P≤0.1%；S≤0.03%；Ni：2.0～5.0%；Mo：1.0～3.0%；V：0.5～3.0%；Cr：15～22%；Cu：0.5～3.0%；Ti：0.5～3.0%。
additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flow chart illustrating the steps of a method for preparing a titanium-containing martensitic wear-resistant cast iron for rolls according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make several modifications to the present invention without departing from the principle of the present invention, and all changes and modifications that are equivalent to those made in the present invention are also within the scope of the appended claims.
The method for preparing the titanium-containing martensitic wear-resistant cast iron for rolls according to the embodiment of the invention is described in detail below.
As shown in fig. 1, the method for preparing the titanium-containing martensitic wear-resistant cast iron for the rolls according to the embodiment of the invention comprises the following steps:
s1, smelting: adding scrap steel, ferromolybdenum, ferrochromium, pure copper and pure nickel into a furnace for smelting, sampling and analyzing the content of each chemical component in the furnace after melting down, adding ferrotitanium and ferrovanadium to adjust the content of the chemical components in the furnace, raising the temperature and preparing tapping;
s2, treatment outside the furnace: silicon-calcium-barium alloy and Fe are added along with the flow in the tapping process2O3Inoculating, modifying and refining the molten steel;
s3, centrifugal casting: when the molten iron in the ladle is cooled to 1340-1400 ℃, rapidly pouring the molten iron into a centrifugal casting mold rotating at a high speed, adding protective slag into the centrifugal casting mold after the pouring is finished, and obtaining the titanium-containing martensite wear-resistant cast iron material for the roller by a centrifugal casting method;
s4, modification treatment: and carrying out heat treatment on the titanium-containing martensite wear-resistant cast iron material for the roller to obtain the titanium-containing martensite wear-resistant cast iron for the roller.
In other words, according to the method for preparing the titanium-containing martensitic wear-resistant cast iron for the roll of the embodiment of the invention, the titanium-containing martensitic wear-resistant cast iron material for the roll can be obtained by smelting, treating outside the furnace and centrifugally casting molten iron, and the titanium-containing martensitic wear-resistant cast iron for the roll, namely the titanium-containing martensitic wear-resistant cast iron working layer material for the roll, is obtained after modification treatment.
Specifically, firstly, adding a certain proportion of scrap steel, ferromolybdenum, ferrochromium, pure copper and pure nickel into an intermediate frequency furnace for smelting, sampling and analyzing the content of each chemical component in the furnace after melting down, adding ferrotitanium and ferrovanadium to adjust the content of the chemical components in the furnace, raising the temperature, and preparing tapping; then, adding silicon-calcium-barium alloy and Fe along with the flow in the tapping process2O3Inoculating, modifying and refining the molten steel; when the molten iron in the ladle is cooled to 1340-1400 ℃, quickly pouring the molten iron into a centrifugal casting mold rotating at a high speed, adding protective slag into the centrifugal casting mold after the pouring is finished, and centrifuging the protective slagThe casting method obtains the titanium-containing martensite wear-resistant cast iron material for the roller; and finally, carrying out heat treatment on the titanium-containing martensite wear-resistant cast iron material for the roller to obtain the titanium-containing martensite wear-resistant cast iron for the roller.
That is, carbide-forming elements, i.e., Cr, Mo, V and Ti, are added on the basis of the iron-based material. Formed Cr7C3Carbide has high wear resistance and thermal stability, and formed Mo2C. The high-hardness particles such as VC, TiC, TiN and the like have high microhardness, so that the wear resistance of the material is greatly improved, meanwhile, a certain amount of solids such as Cr, Mo, V, Ti and the like are dissolved in the matrix and then have the effects of strengthening the matrix and facilitating the formation of martensite, and the addition of Cu and Ni enlarges the austenite forming area. Finally, as-cast martensite and a large amount of retained austenite can be formed.
Therefore, according to the preparation method of the titanium-containing martensitic wear-resistant cast iron for the roller, by adding ferromolybdenum, ferrochromium, pure copper and pure nickel, ferrotitanium and ferrovanadium, not only can martensite be easily formed, but also the matrix can be strengthened. The carbide formed by Cr, Mo, V and Ti not only has higher wear resistance, but also has higher thermal stability. By adding Si-Ca-Ba alloy and Fe2O3The carbide formed after the molten iron is treated is more dispersed, the cutting-off effect on a matrix is smaller, the toughness of the material is improved, and meanwhile, the impact resistance of the material is greatly improved as C and O in the molten iron react to reduce harmful elements N and H in the material. Therefore, the titanium-containing martensite wear-resistant cast iron for the roller manufactured by the preparation method has higher wear resistance and impact resistance.
Further, in step S1, ferrotitanium and ferrovanadium are added within 2-5 minutes before tapping.
According to one embodiment of the invention, in step S1, the titanium-containing martensite wear-resistant cast iron for the rolls after adjusting the chemical composition content in the furnace comprises the following components in percentage by weight: c: 2.5-3.5%; si: 0.5-2.0%; mn: 0.5-2.0%; p is less than or equal to 0.1 percent; s is less than or equal to 0.03 percent; ni: 2.0-5.0%; mo: 1.0-3.0%; v: 0.5-3.0%; cr: 15-22%; cu: 0.5-3.0%; ti: 0.5 to 3.0 percent. That is, by forming a foundation on an iron-based materialAdding carbide-forming elements, namely Cr, Mo, V and Ti. Cr formed from Cr7C3The carbide has high wear resistance and thermal stability, and Mo formed by Mo, V and Ti2C. High microhardness of hard particle substances such as VC, TiC, TiN and the like greatly improves the wear resistance of the material. Meanwhile, a certain amount of solid such as Cr, Mo, V, Ti and the like is dissolved in the matrix to strengthen the matrix and facilitate the formation of martensite, and the addition of Cu and Ni enlarges the austenite forming area. Finally, as-cast martensite and a large amount of retained austenite can be formed.
Optionally, in step S1, tapping is performed when the temperature is raised to 1600-1620 ℃.
Preferably, in step S2, the content of the silicon-calcium-barium alloy is 2 to 4 Kg/ton of iron.
Further, in step S2, Fe2O3The content of (b) is 4-7 Kg/ton of iron.
In some embodiments of the present invention, in the step S3, the amount of the mold flux is 8 to 10Kg/m2。
Preferably, the mold flux is O-type mold flux.
According to an embodiment of the present invention, the heat treatment in step S4 is a tempering treatment at 500 to 600 ℃. Therefore, the titanium-containing martensite wear-resistant cast iron material for the roller does not need high-temperature quenching treatment, and can obtain an ideal tempered structure, namely martensite and carbide after tempering treatment only by low-temperature tempering, so that the hardness and the wear resistance of the titanium-containing martensite wear-resistant cast iron material for the roller are improved, and the roller manufactured by the material has the advantages of high wear resistance, high steel content, long service life and the like.
Specifically, firstly, adding scrap steel, ferromolybdenum, ferrochromium, pure copper and pure nickel in a certain ratio into an intermediate frequency furnace for smelting, sampling and analyzing after melting down, adding ferrotitanium and ferrovanadium within 2-5 minutes before tapping, and adjusting the chemical component content in the furnace to ensure that the titanium-containing martensite wear-resistant cast iron for the roller comprises the following components in percentage by weight: c: 2.5-3.5%; si: 0.5-2.0%; mn: 0.5-2.0%; p is less than or equal to 0.1 percent; s is less than or equal to 0.03 percent; ni: 2.0-5.0%; mo: 1.0-3.0%; v: 0.5-3.0%; cr: 15-22%; cu: 0.5-3.0%; ti: 0.5 to 3.0% of the total weight of the composition. The balance of Fe and inevitable impurities, and tapping when the temperature is raised to 1600-1620 ℃; adding 2-4 Kg/ton of iron-silicon-calcium-barium alloy and 4-7 Kg/ton of iron-Fe with the flow in the tapping process2O3Carrying out inoculation modification and refining treatment on molten iron; then, when the temperature of the molten iron in the ladle is reduced to 1340-1400 ℃, the molten iron is rapidly poured into a centrifugal casting mold rotating at a high speed, and 8-10 Kg/m is added into the casting mold after the pouring is finished2The O-shaped protective slag is prepared into the titanium-containing martensite wear-resistant cast iron material for the roller by a centrifugal casting method; and finally, tempering the titanium-containing martensite wear-resistant cast iron material for the centrifugally cast as-cast roller at 500-600 ℃ to obtain an ideal titanium-containing martensite wear-resistant cast iron working layer material for the roller.
In summary, according to the preparation method of the titanium-containing martensite wear-resistant cast iron for the roller, compared with the traditional bainite ductile iron, semisteel, graphite steel and other materials, the single-groove single-time steel passing amount of the obtained titanium-containing martensite wear-resistant cast iron for the roller can be increased by 2-4 times, and the comprehensive service life can be increased by 3-5 times. The roller made of the titanium-containing martensite wear-resistant cast iron has higher hardness and wear resistance, the roller changing times can be reduced to a great extent, the operation rate of a rolling mill is improved, the rolling cost is reduced, and the surface quality of a rolled product is obviously improved.
The martensite wear-resistant cast iron comprises the following components in percentage by weight: c: 2.5-3.5%; si: 0.5-2.0%; mn: 0.5-2.0%; p is less than or equal to 0.1 percent; s is less than or equal to 0.03 percent; ni: 2.0-5.0%; mo: 1.0-3.0%; v: 0.5-3.0%; cr: 15-22%; cu: 0.5-3.0%; ti: 0.5-3.0%; the balance of Fe and inevitable impurities.
Therefore, the martensitic wear-resistant cast iron according to the embodiment of the invention can be prepared by the preparation method of the titanium-containing martensitic wear-resistant cast iron for the roll, and has the same characteristics, namely high wear resistance and hardness, as the titanium-containing martensitic wear-resistant cast iron for the roll obtained by the preparation method of the titanium-containing martensitic wear-resistant cast iron for the roll.
The present invention will be more fully understood by those skilled in the art from the following examples and comparative examples, but the present invention is not limited thereto.
Example one
Preparing a titanium-containing martensite wear-resistant cast iron working layer material of a phi 980 х 1800mm channel steel finishing roll, wherein the target titanium-containing martensite wear-resistant cast iron working layer material comprises the following chemical components in percentage by weight: c: 2.5-3.5%; si: 0.5-2.0%; mn: 0.5-2.0%; p is less than or equal to 0.1 percent; s is less than or equal to 0.03 percent; ni: 2.0-5.0%; mo: 1.0-3.0%; v: 0.5-3.0%; cr: 15-22%; cu: 0.5-3.0%; ti: 0.5-3.0%; the balance of Fe and inevitable impurities, and the specific steps are as follows:
1) and smelting: adding scrap steel, ferromolybdenum, ferrochromium, pure copper and pure nickel into an intermediate frequency furnace for smelting, sampling and analyzing after melting down, adjusting the chemical components in the furnace according to the components of a sample before the furnace, adding ferrotitanium and ferrovanadium within 3 minutes before tapping, wherein the titanium-containing martensite wear-resistant cast iron working layer material of the tapping final sample comprises the following chemical components in percentage by weight: 2.7 percent of C, 0.8 percent of Si, 0.75 percent of Mn, 0.08 percent of P, less than or equal to 0.025 percent of S, 2.6 percent of Ni, 1.8 percent of Mo, 0.85 percent of V, 16 percent of Cr, 0.55 percent of Cu, 0.87 percent of Ti and the balance of Fe and inevitable impurities, and tapping when the temperature is raised to 1605 ℃.
2) And (3) treating outside the furnace: 2.5 Kg/ton of Fe-Si-Ca-Ba alloy and 5 Kg/ton of Fe are added with the steel during the tapping process2O3And carrying out inoculation modification and refining treatment on the molten iron.
3) And centrifugal casting: when the temperature of the molten iron in the ladle is reduced to 1346 ℃, the molten iron is rapidly poured into a centrifugal casting mold rotating at a high speed, and 8Kg/m is added into the casting mold after pouring2The titanium-containing martensite wear-resistant cast iron material for the roller is obtained by the O-shaped casting powder through a centrifugal casting method.
4) And modification treatment: the titanium-containing martensite wear-resistant cast iron material for the centrifugally cast as-cast roller is subjected to tempering heat treatment at 530 ℃ to obtain an ideal titanium-containing martensite wear-resistant cast iron working layer material for the roller, and the specific properties are shown in Table 1.
The roll working layer material prepared by the material is proved to be improved by 2.5 times compared with the single-time steel passing amount of the traditional bainite ductile iron, semisteel, graphite steel and other materials in a single groove by using a machine, the comprehensive service life can be improved by 3.8 times, the roll changing times are reduced, the operation rate of a rolling mill is improved by 10 percent, the rolling cost is reduced, the surface quality of a rolled product is obviously improved, and the satisfactory use effect is obtained.
Example two
Preparing a phi 1050 х 2200mm T-shaped steel finishing roll titanium-containing martensite wear-resistant cast iron working layer material, wherein the target titanium-containing martensite wear-resistant cast iron working layer material comprises the following chemical components in percentage by weight: c: 2.5-3.5%; si: 0.5-2.0%; mn: 0.5-2.0%; p is less than or equal to 0.1 percent; s is less than or equal to 0.03 percent; ni: 2.0-5.0%; mo: 1.0-3.0%; v: 0.5-3.0%; cr: 15-22%; cu: 0.5-3.0%; ti: 0.5-3.0%; the balance of Fe and inevitable impurities, and the specific steps are as follows:
1) and smelting: adding scrap steel, ferromolybdenum, ferrochromium, pure copper and pure nickel into an intermediate frequency furnace for smelting, sampling and analyzing after melting down, adjusting the chemical components in the furnace according to the components of a sample before the furnace, adding ferrotitanium and ferrovanadium within 3 minutes before tapping, wherein the titanium-containing martensite wear-resistant cast iron working layer material of the tapping final sample comprises the following chemical components in percentage by weight: 3.1 percent of C, 0.85 percent of Si, 0.76 percent of Mn, 0.07 percent of P, less than or equal to 0.027 percent of S, 3.8 percent of Ni, 2.3 percent of Mo, 2.1 percent of V, 20 percent of Cr, 0.83 percent of Cu, 1.8 percent of Ti and the balance of Fe and inevitable impurities, and tapping when the temperature is increased to 1615 ℃.
2) And (3) treating outside the furnace: 3.1 Kg/ton of Fe-Si-Ca-Ba alloy and 6 Kg/ton of Fe are added with the steel during the tapping process2O3And carrying out inoculation modification and refining treatment on the molten iron.
3) And centrifugal casting: when the temperature of the molten iron in the ladle is reduced to 1358 ℃, the molten iron is rapidly poured into a centrifugal casting mold rotating at a high speed, and 8Kg/m is added into the casting mold after pouring2The titanium-containing martensite wear-resistant cast iron material for the roller is obtained by the O-shaped casting powder through a centrifugal casting method.
4) And modification treatment: the titanium-containing martensite wear-resistant cast iron material for the centrifugally cast as-cast roller is subjected to tempering heat treatment at 560 ℃ to obtain an ideal titanium-containing martensite wear-resistant cast iron working layer material for the roller, and the specific properties are shown in Table 1.
Therefore, the roll working layer material prepared by the material is used on a machine to prove that compared with the single-groove single-pass steel passing amount of the traditional materials such as bainite ductile iron, semisteel, graphite steel and the like, the steel passing amount is improved by 3.2 times, the comprehensive service life can be improved by 4.1 times, the roll changing times are reduced, the operation rate of a rolling mill is improved by 13 percent, the rolling cost is reduced, the surface quality of a rolled product is obviously improved, and the satisfactory use effect is obtained.
EXAMPLE III
Preparing a titanium-containing martensite wear-resistant cast iron working layer material of a steel sheet pile finishing roll with the diameter of phi 1400 х 2800mm, wherein the target titanium-containing martensite wear-resistant cast iron working layer material comprises the following chemical components in percentage by weight: c: 2.5-3.5%; si: 0.5-2.0%; mn: 0.5-2.0%; p is less than or equal to 0.1 percent; s is less than or equal to 0.03 percent; ni: 2.0-5.0%; mo: 1.0-3.0%; v: 0.5-3.0%; cr: 15-22%; cu: 0.5-3.0%; ti: 0.5-3.0%; the balance of Fe and inevitable impurities, and the specific steps are as follows:
1) and smelting: adding scrap steel, ferromolybdenum, ferrochromium, pure copper and pure nickel into an intermediate frequency furnace for smelting, sampling and analyzing after melting down, adjusting the chemical components in the furnace according to the components of a sample before the furnace, adding ferrotitanium and ferrovanadium within 3 minutes before tapping, wherein the titanium-containing martensite wear-resistant cast iron working layer material of the tapping final sample comprises the following chemical components in percentage by weight: 3.0 percent of C, 0.92 percent of Si, 0.93 percent of Mn, 0.08 percent of P, less than or equal to 0.023 percent of S, 3.9 percent of Ni, 2.5 percent of Mo, 2.4 percent of V, 19 percent of Cr, 0.88 percent of Cu, 2.5 percent of Ti and the balance of Fe and inevitable impurities, and tapping when the temperature is increased to 1611 ℃.
2) And (3) treating outside the furnace: 3.5 Kg/ton of Fe-Si-Ca-Ba alloy and 6.3 Kg/ton of Fe were added with the stream during the tapping process2O3And carrying out inoculation modification and refining treatment on the molten iron.
3) And centrifugal casting: when the temperature of the molten iron in the ladle is reduced to 1378 ℃, the molten iron is quickly poured into a centrifugal casting mold rotating at a high speed, and 9Kg/m is added into the casting mold after pouring2The titanium-containing martensite wear-resistant cast iron material for the roller is obtained by the O-shaped casting powder through a centrifugal casting method.
4) And modification treatment: the titanium-containing martensite wear-resistant cast iron material for the centrifugally cast as-cast roller is subjected to tempering heat treatment at 590 ℃ to obtain an ideal titanium-containing martensite wear-resistant cast iron working layer material for the roller, and the specific properties are shown in Table 1.
The roll working layer material prepared by the material is proved to be improved by 3.5 times compared with the single-time steel passing amount of a single groove of the traditional materials such as bainite ductile iron, semisteel, graphite steel and the like by using a machine, the comprehensive service life can be improved by 4.4 times, the roll changing times are reduced, the operation rate of a rolling mill is improved by 15 percent, the rolling cost is reduced, the surface quality of a rolled product is obviously improved, and the satisfactory use effect is obtained.
Table 1 is a table of values of tensile strength, hardness, and impact toughness obtained after performance tests were performed in examples 1 to 3 of the method for producing a martensitic wear-resistant titanium-containing cast iron for a roll according to an example of the present invention.
TABLE 1 Performance test Table for Ti-containing martensite wear-resistant cast iron working layer material for roller
| Order of item | Tensile strength (MPa) | Hardness (HSC) | Impact toughness (j) |
| Example 1 | 673 | 78 | 6.3 |
| Example 2 | 725 | 83 | 5.8 |
| Example 3 | 744 | 85 | 5.5 |
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The preparation method of the titanium-containing martensite wear-resistant cast iron for the roller is characterized by comprising the following steps of:
s1, smelting: adding scrap steel, ferromolybdenum, ferrochromium, pure copper and pure nickel into a furnace for smelting, sampling and analyzing the content of each chemical component in the furnace after melting down, adding ferrotitanium and ferrovanadium to adjust the content of the chemical components in the furnace, raising the temperature and preparing tapping;
s2, treatment outside the furnace: silicon-calcium-barium alloy and Fe are added along with the flow in the tapping process2O3Inoculating, modifying and refining the molten steel;
s3, centrifugal casting: when the temperature of molten iron in the ladle is reduced to 1340-1400 ℃, rapidly pouring the molten iron into a centrifugal casting mold rotating at a high speed, adding protective slag into the centrifugal casting mold after the pouring is finished, and obtaining the titanium-containing martensite wear-resistant cast iron material for the roller by a centrifugal casting method;
s4, modification treatment: and carrying out heat treatment on the titanium-containing martensite wear-resistant cast iron material for the roller to obtain the titanium-containing martensite wear-resistant cast iron for the roller.
2. The method for preparing the titanium-containing martensitic wear-resistant cast iron as claimed in claim 1, wherein in the step S1, ferrotitanium and ferrovanadium are added within 2-5 minutes before tapping.
3. The method for preparing the titanium-containing martensitic wear-resistant cast iron for the rolls according to claim 1, wherein in the step S1, the titanium-containing martensitic wear-resistant cast iron for the rolls after adjusting the chemical composition content in the furnace comprises the following components in percentage by weight: c: 2.5-3.5%; si: 0.5-2.0%; mn: 0.5-2.0%; p is less than or equal to 0.1 percent; s is less than or equal to 0.03 percent; ni: 2.0-5.0%; mo: 1.0-3.0%; v: 0.5-3.0%; cr: 15-22%; cu: 0.5-3.0%; ti: 0.5 to 3.0 percent.
4. The method for preparing the titanium-containing martensitic wear-resistant cast iron as claimed in claim 1, wherein in the step S1, iron is tapped when the temperature is raised to 1600-1620 ℃.
5. The method for preparing the titanium-containing martensitic wear-resistant cast iron as claimed in claim 1, wherein the content of the silicon-calcium-barium alloy in S2 is 2-4 Kg/ton of iron.
6. The method for preparing the titanium-containing martensitic wear-resistant cast iron as claimed in claim 1, wherein in the step S2, Fe is added2O3 The content of (b) is 4-7 Kg/ton of iron.
7. The method for preparing the titanium-containing martensitic wear-resistant cast iron as claimed in claim 1, wherein the amount of the mold flux in the S3 is 8-10 Kg/m2。
8. The method for preparing the titanium-containing martensitic wear-resistant cast iron as claimed in claim 7, wherein the mold flux is O-type mold flux.
9. The method for preparing the titanium-containing martensitic wear-resistant cast iron as claimed in claim 1, wherein the heat treatment in S4 is a tempering treatment at 500 to 600 ℃.
10. The martensitic wear-resistant cast iron prepared by the method for preparing the titanium-containing martensitic wear-resistant cast iron according to any one of claims 1 to 9, which is characterized by comprising the following components in percentage by weight:
C：2.5～3.5%；Si：0.5～2.0%；Mn：0.5～2.0%；P≤0.1%；S≤0.03%；Ni：2.0～5.0%；Mo：1.0～3.0%；V：0.5～3.0%；Cr：15～22%；Cu：0.5～3.0%；Ti：0.5～3.0%。
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